Abstract
The cost of irrigation water has been computed for two shallow-well, water-pumping windmill designs in India. An empirical relationship for variation of the overall efficiency of the windmills with wind-speed is established. Weibull parameters are computed for Indore, Madras and New Delhi and are used to estimate monthly overall efficiencies, hydraulic outputs and the costs of delivered water. Regions in India where windmill irrigation may be economically preferable to alternative technologies for water-pumping have been identified. The trend of windmill installation in recent years is briefly analysed.
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